US7589928B2 - Magnetic recording device including a thermal proximity sensor - Google Patents
Magnetic recording device including a thermal proximity sensor Download PDFInfo
- Publication number
- US7589928B2 US7589928B2 US11/724,739 US72473907A US7589928B2 US 7589928 B2 US7589928 B2 US 7589928B2 US 72473907 A US72473907 A US 72473907A US 7589928 B2 US7589928 B2 US 7589928B2
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- sensor
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- magnetic medium
- magnetic recording
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- Expired - Fee Related
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Images
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/313—Disposition of layers
- G11B5/3133—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/313—Disposition of layers
- G11B5/3133—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure
- G11B5/314—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/40—Protective measures on heads, e.g. against excessive temperature
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6011—Control of flying height
- G11B5/6064—Control of flying height using air pressure
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6011—Control of flying height
- G11B5/607—Control of flying height using thermal means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetic Heads (AREA)
Abstract
Description
where q is the amount of heat transferred between the head and the medium, h is the separation between the head and the medium, p is the pressure at the sensor, c is a constant that depends on the molecular properties of the air surrounding the head and the medium, T is the ambient temperature, Ka is the conductivity of air, and ΔT is the difference in temperature between the head and the medium. Thus, because the amount of heat transferred between the head and the medium is proportional to ΔT and inversely proportional to h, the temperature at the medium confronting surface of the head may be measured to continuously monitor changes in the HMS.
V(y+Δy)=V(y)e −nkΔy (Equation 2),
where k is the spatial frequency of the applied signal and Δy is the change in the HMS. For a signal with wavelength λ, the change in HMS, which can be used to set the writer heater power and ensure the clearance is set to the desired value, is given by:
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/724,739 US7589928B2 (en) | 2007-03-16 | 2007-03-16 | Magnetic recording device including a thermal proximity sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/724,739 US7589928B2 (en) | 2007-03-16 | 2007-03-16 | Magnetic recording device including a thermal proximity sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080225426A1 US20080225426A1 (en) | 2008-09-18 |
US7589928B2 true US7589928B2 (en) | 2009-09-15 |
Family
ID=39762411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/724,739 Expired - Fee Related US7589928B2 (en) | 2007-03-16 | 2007-03-16 | Magnetic recording device including a thermal proximity sensor |
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US (1) | US7589928B2 (en) |
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US20100142080A1 (en) * | 2008-12-08 | 2010-06-10 | Youping Deng | Methods and apparatus to detect surface characteristics on magnetic read/write heads |
US20110211275A1 (en) * | 2010-02-26 | 2011-09-01 | Tdk Corporation | Method of determining flying height of magnetic head |
US20110216430A1 (en) * | 2010-03-05 | 2011-09-08 | Tdk Corporation | Magnetic head including sensor |
US20110228652A1 (en) * | 2010-03-19 | 2011-09-22 | Edward Charles Gage | Slider For Heat Assisted Magnetic Recording Including A Photo Detector For Monitoring Laser Power |
US20110228651A1 (en) * | 2010-03-19 | 2011-09-22 | Edward Charles Gage | Slider For Heat Assisted Magnetic Recording Including A Thermal Sensor For Monitoring Laser Power |
US20120099218A1 (en) * | 2010-10-21 | 2012-04-26 | Masayuki Kurita | Magnetic-recording head with first thermal fly-height control element and embedded contact sensor element configurable as second thermal fly-height control element |
US20120120521A1 (en) * | 2010-11-17 | 2012-05-17 | Masayuki Kurita | Contact detection between a disk and magnetic head |
US20120120528A1 (en) * | 2010-11-16 | 2012-05-17 | Masaru Furukawa | Noise and particle shield for contact sensor in a slider |
US8199431B2 (en) | 2010-04-08 | 2012-06-12 | Tdk Corporation | Magnetic head including sensor |
US8213117B2 (en) | 2010-06-04 | 2012-07-03 | Tdk Corporation | Magnetic head with protective layer and a protective film removal method for the magnetic head |
US8335053B2 (en) | 2010-10-28 | 2012-12-18 | Hitachi Global Storage Technologies Netherlands B.V. | Integrated touch-down pad and touch-down sensor |
US8351157B2 (en) | 2010-07-06 | 2013-01-08 | Tdk Corporation | Thin film magnetic head having temperature detection mechanism, head gimbals assembly, head arm assembly and magnetic disk device |
US8373947B1 (en) | 2011-09-29 | 2013-02-12 | Tdk Corporation | Magnetic head slider including protective film for head-to-medium spacing detecting element |
US8451696B2 (en) | 2011-10-31 | 2013-05-28 | HGST Netherlands B.V. | Temperature sensor in a thermally assisted magnetic recording head |
US8542456B2 (en) | 2011-08-25 | 2013-09-24 | Tdk Corporation | Magnetic head having a contact sensor |
US8547805B1 (en) | 2012-03-28 | 2013-10-01 | Tdk Corporation | Thermally-assisted magnetic recording head having temperature sensor embedded on dielectric waveguide |
US20140023108A1 (en) * | 2012-07-23 | 2014-01-23 | Seagate Technology Llc | Using first and second resistive sensor bias levels to detect head-to-disk contact and/or clearance |
US8643981B2 (en) | 2011-12-28 | 2014-02-04 | HGST Netherlands B. V. | Magnetic domain control for an embedded contact sensor for a magnetic recording head |
US8670214B1 (en) | 2011-12-20 | 2014-03-11 | Western Digital (Fremont), Llc | Method and system for providing enhanced thermal expansion for hard disk drives |
US8705323B2 (en) | 2011-10-31 | 2014-04-22 | HGST Netherlands B.V. | TAR temperature sensor having faster response time |
US8717711B2 (en) | 2011-09-28 | 2014-05-06 | HGST Netherlands B.V. | Low clearance magnetic head having a contact detection sensor |
US8730607B1 (en) | 2012-11-30 | 2014-05-20 | HGST Netherlands B.V. | Thermoelectric voltage-based differential contact sensor |
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Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5130866A (en) | 1990-07-17 | 1992-07-14 | International Business Machines Corporation | Method and circuitry for in-situ measurement of transducer/recording medium clearance and transducer magnetic instability |
US5527110A (en) | 1993-04-30 | 1996-06-18 | International Business Machines Corporation | Method and apparatus for detecting asperities on magnetic disks using thermal proximity imaging |
US5753803A (en) | 1996-11-21 | 1998-05-19 | International Business Machines Corporation | Apparatus and methods for maintaining a substantially constant temperature in a thermal proximity sensor |
US5810477A (en) | 1993-04-30 | 1998-09-22 | International Business Machines Corporation | System for identifying surface conditions of a moving medium |
US6071007A (en) | 1997-05-21 | 2000-06-06 | Seagate Technology, Inc. | Thermal asperity detection head |
US6262572B1 (en) | 1996-07-25 | 2001-07-17 | Seagate Technology Llc | Thermo-resistive glide test head for disc drive recording media |
US20030058559A1 (en) * | 2001-09-27 | 2003-03-27 | Seagate Technology Llc | Gap fly height sensing using thermal load response |
US6952330B1 (en) | 1999-06-11 | 2005-10-04 | Seagate Technology Llc | Dynamic flying attitude control using augmented gimbal |
US6975472B2 (en) | 2003-09-12 | 2005-12-13 | Seagate Technology Llc | Head with heating element and control regime therefor |
US6980399B2 (en) | 2003-10-15 | 2005-12-27 | Seagate Technology Llc | Air bearing sliders with a pressure cavity or cavities |
US7030875B2 (en) | 2002-09-04 | 2006-04-18 | Honda Motor Company Ltd. | Environmental reasoning using geometric data structure |
US7054084B2 (en) | 2003-08-29 | 2006-05-30 | Hitachi Global Storage Technologies Netherlands B.V. | Method, apparatus and program storage device for sensing increased resistance changes in an MR element to detect MR sensor events |
US20070230020A1 (en) * | 2006-03-29 | 2007-10-04 | Michael Leis | Controlling head flying height based on head heater resistance |
US20070268608A1 (en) * | 2006-05-19 | 2007-11-22 | Fujitsu Limited | Head floating amount control method and unit, storage apparatus and computer-readable program |
US20080112076A1 (en) * | 2006-11-15 | 2008-05-15 | International Business Machines Corporation | Magnetic spacing and tape characteristic compensation system and method |
-
2007
- 2007-03-16 US US11/724,739 patent/US7589928B2/en not_active Expired - Fee Related
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5130866A (en) | 1990-07-17 | 1992-07-14 | International Business Machines Corporation | Method and circuitry for in-situ measurement of transducer/recording medium clearance and transducer magnetic instability |
US5527110A (en) | 1993-04-30 | 1996-06-18 | International Business Machines Corporation | Method and apparatus for detecting asperities on magnetic disks using thermal proximity imaging |
US5810477A (en) | 1993-04-30 | 1998-09-22 | International Business Machines Corporation | System for identifying surface conditions of a moving medium |
US5850374A (en) | 1993-04-30 | 1998-12-15 | International Business Machines Corporation | Method and apparatus for data storage using thermal proximity imaging |
US6052249A (en) | 1993-04-30 | 2000-04-18 | International Business Machines Corporation | Method and apparatus for data storage using thermal proximity imaging |
US6262572B1 (en) | 1996-07-25 | 2001-07-17 | Seagate Technology Llc | Thermo-resistive glide test head for disc drive recording media |
US5753803A (en) | 1996-11-21 | 1998-05-19 | International Business Machines Corporation | Apparatus and methods for maintaining a substantially constant temperature in a thermal proximity sensor |
US6071007A (en) | 1997-05-21 | 2000-06-06 | Seagate Technology, Inc. | Thermal asperity detection head |
US6952330B1 (en) | 1999-06-11 | 2005-10-04 | Seagate Technology Llc | Dynamic flying attitude control using augmented gimbal |
US20030058559A1 (en) * | 2001-09-27 | 2003-03-27 | Seagate Technology Llc | Gap fly height sensing using thermal load response |
US7030875B2 (en) | 2002-09-04 | 2006-04-18 | Honda Motor Company Ltd. | Environmental reasoning using geometric data structure |
US7054084B2 (en) | 2003-08-29 | 2006-05-30 | Hitachi Global Storage Technologies Netherlands B.V. | Method, apparatus and program storage device for sensing increased resistance changes in an MR element to detect MR sensor events |
US6975472B2 (en) | 2003-09-12 | 2005-12-13 | Seagate Technology Llc | Head with heating element and control regime therefor |
US6980399B2 (en) | 2003-10-15 | 2005-12-27 | Seagate Technology Llc | Air bearing sliders with a pressure cavity or cavities |
US20070230020A1 (en) * | 2006-03-29 | 2007-10-04 | Michael Leis | Controlling head flying height based on head heater resistance |
US20070268608A1 (en) * | 2006-05-19 | 2007-11-22 | Fujitsu Limited | Head floating amount control method and unit, storage apparatus and computer-readable program |
US20080112076A1 (en) * | 2006-11-15 | 2008-05-15 | International Business Machines Corporation | Magnetic spacing and tape characteristic compensation system and method |
Cited By (59)
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---|---|---|---|---|
US7982987B2 (en) * | 2008-12-08 | 2011-07-19 | Hitachi Global Storage Technologies Netherlands B.V. | Methods and apparatus to detect surface characteristics on magnetic read/write heads |
US20100142080A1 (en) * | 2008-12-08 | 2010-06-10 | Youping Deng | Methods and apparatus to detect surface characteristics on magnetic read/write heads |
US8085491B2 (en) | 2010-02-26 | 2011-12-27 | Tdk Corporation | Method of determining flying height of magnetic head |
US20110211275A1 (en) * | 2010-02-26 | 2011-09-01 | Tdk Corporation | Method of determining flying height of magnetic head |
US20110216430A1 (en) * | 2010-03-05 | 2011-09-08 | Tdk Corporation | Magnetic head including sensor |
US8274761B2 (en) | 2010-03-05 | 2012-09-25 | Tdk Corporation | Magnetic head including a thermal asperity effect element sensor in a stepped-back position from an air bearing surface |
US20110228651A1 (en) * | 2010-03-19 | 2011-09-22 | Edward Charles Gage | Slider For Heat Assisted Magnetic Recording Including A Thermal Sensor For Monitoring Laser Power |
US20110228652A1 (en) * | 2010-03-19 | 2011-09-22 | Edward Charles Gage | Slider For Heat Assisted Magnetic Recording Including A Photo Detector For Monitoring Laser Power |
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US8199431B2 (en) | 2010-04-08 | 2012-06-12 | Tdk Corporation | Magnetic head including sensor |
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US8773801B2 (en) * | 2010-10-21 | 2014-07-08 | HGST Netherlands B.V. | Magnetic-recording head with first thermal fly-height control element and embedded contact sensor element configurable as second thermal fly-height control element |
US8335053B2 (en) | 2010-10-28 | 2012-12-18 | Hitachi Global Storage Technologies Netherlands B.V. | Integrated touch-down pad and touch-down sensor |
US20120120528A1 (en) * | 2010-11-16 | 2012-05-17 | Masaru Furukawa | Noise and particle shield for contact sensor in a slider |
US8477455B2 (en) * | 2010-11-16 | 2013-07-02 | HGST Netherlands B.V. | Noise and particle shield for contact sensor in a slider |
US20120120521A1 (en) * | 2010-11-17 | 2012-05-17 | Masayuki Kurita | Contact detection between a disk and magnetic head |
US8711508B2 (en) * | 2010-11-17 | 2014-04-29 | HGST Netherlands B.V. | Contact detection between a disk and magnetic head |
US8792311B2 (en) | 2011-02-08 | 2014-07-29 | Seagate Technology Llc | Transducer head temperature monitoring |
US8937853B2 (en) | 2011-02-08 | 2015-01-20 | Seagate Technology Llc | Transducer head temperature monitoring |
US8767345B2 (en) | 2011-04-12 | 2014-07-01 | HGST Netherlands B.V. | Magnetic head having a contact detection sensor |
US8542456B2 (en) | 2011-08-25 | 2013-09-24 | Tdk Corporation | Magnetic head having a contact sensor |
US8717711B2 (en) | 2011-09-28 | 2014-05-06 | HGST Netherlands B.V. | Low clearance magnetic head having a contact detection sensor |
US8373947B1 (en) | 2011-09-29 | 2013-02-12 | Tdk Corporation | Magnetic head slider including protective film for head-to-medium spacing detecting element |
US8854764B2 (en) | 2011-09-30 | 2014-10-07 | HGST Netherlands B.V. | Multiple-sense thermo-resistive sensor for contact detection of read-write heads |
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US8451696B2 (en) | 2011-10-31 | 2013-05-28 | HGST Netherlands B.V. | Temperature sensor in a thermally assisted magnetic recording head |
US8749920B1 (en) * | 2011-12-16 | 2014-06-10 | Western Digital (Fremont), Llc | Magnetic recording head with dynamic fly height heating and having thermally controlled pole tip protrusion to control and protect reader element |
US8670214B1 (en) | 2011-12-20 | 2014-03-11 | Western Digital (Fremont), Llc | Method and system for providing enhanced thermal expansion for hard disk drives |
US8830614B2 (en) | 2011-12-21 | 2014-09-09 | HGST Netherlands B.V. | Balanced embedded contact sensor with low noise architecture |
US8643981B2 (en) | 2011-12-28 | 2014-02-04 | HGST Netherlands B. V. | Magnetic domain control for an embedded contact sensor for a magnetic recording head |
US8879189B2 (en) | 2012-01-25 | 2014-11-04 | HGST Netherlands B.V. | Magnetic head slider having shared heater and contact sensor terminal pads |
US8547805B1 (en) | 2012-03-28 | 2013-10-01 | Tdk Corporation | Thermally-assisted magnetic recording head having temperature sensor embedded on dielectric waveguide |
US20140023108A1 (en) * | 2012-07-23 | 2014-01-23 | Seagate Technology Llc | Using first and second resistive sensor bias levels to detect head-to-disk contact and/or clearance |
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US8730607B1 (en) | 2012-11-30 | 2014-05-20 | HGST Netherlands B.V. | Thermoelectric voltage-based differential contact sensor |
US20140368953A1 (en) * | 2013-06-12 | 2014-12-18 | International Business Machines Corporation | Tape head with tape-bearing surface exhibiting an array of protruding topographic features |
US9030779B2 (en) * | 2013-06-12 | 2015-05-12 | International Business Machines Corporation | Tape head with tape-bearing surface exhibiting an array of protruding topographic features |
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US20150062754A1 (en) * | 2013-08-28 | 2015-03-05 | Seagate Technology Llc | Writer core incorporating thermal sensor having a temperature coefficient of resistance |
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US9685201B2 (en) * | 2015-07-10 | 2017-06-20 | International Business Machines Corporation | Corrosion and/or oxidation damage protection for tunnel junctions |
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US9679588B1 (en) * | 2016-01-18 | 2017-06-13 | International Business Machines Corporation | Corrosion resistance in air bearing surfaces |
US9431033B1 (en) * | 2016-01-18 | 2016-08-30 | International Business Machines Corporation | Corrosion resistance in air bearing surfaces |
US9916848B2 (en) | 2016-01-18 | 2018-03-13 | International Business Machines Corporation | Corrosion resistance in air bearing surfaces |
US9431034B1 (en) * | 2016-01-18 | 2016-08-30 | International Business Machines Corporation | Corrosion resistance in air bearing surfaces |
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US11386921B2 (en) | 2020-09-30 | 2022-07-12 | Seagate Technology Llc | Read head stress reduction |
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